// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
#include <pollux/functions/lib/rows_translation_util.h>

namespace kumo::pollux::functions {
    BufferPtr getElementToTopLevelRows(
        vector_size_t numElements,
        const SelectivityVector &topLevelRows,
        const vector_size_t *rawOffsets,
        const vector_size_t *rawSizes,
        const uint64_t *rawNulls,
        memory::MemoryPool *pool) {
        auto toTopLevelRows = allocate_indices(numElements, pool);
        auto rawToTopLevelRows = toTopLevelRows->asMutable<vector_size_t>();
        topLevelRows.applyToSelected([&](vector_size_t row) {
            if (rawNulls && bits::isBitNull(rawNulls, row)) {
                return;
            }
            auto size = rawSizes[row];
            auto offset = rawOffsets[row];
            for (int i = 0; i < size; ++i) {
                rawToTopLevelRows[offset + i] = row;
            }
        });
        return toTopLevelRows;
    }
} // namespace kumo::pollux::functions
